Garmin Forerunner 920XT White/Red GPS Sports Watch (Certified Refurbished) VO2 MAX, RECOVERY TIME & RACE PREDICTOR2 Forerunner 920XT estimates VO2 max, recovery time and predicts your race times for several distances when used with heart rate. When used with a power meter, it estimates VO2 max for cycling as well. RUNNING DYNAMICS1 When paired with the HRM-RunTM monitor, the Forerunner 920XT provides feedback on running form by measuring cadence, vertical oscillation and ground contact time. METRICS THAT MATTER Record speed, distance, ascent/descent, grade and more. Pair with ANT+ compatible sensors to measure heart rate4, speed4, cadence4 and power4. Control VIRB Elite action camera4 to record and relive your accomplishments SMART NOTIFICATIONS3 See incoming email, text messages, call alerts, calendar reminders and more from your compatible smartphone. LIVE TRACKING3 Let friends and family follow your races and training activities in real time.